/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 1994 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/

/*
 * Portions of this source code were derived from Berkeley 4.3 BSD
 * under license from the Regents of the University of California.
 */

#ifndef _ARPA_NAMESER_H
#define	_ARPA_NAMESER_H

#include <sys/isa_defs.h>

#ifdef	__cplusplus
extern "C" {
#endif

/*
 * Define constants based on rfc883
 */
#define	PACKETSZ	512		/* maximum packet size */
#define	MAXDNAME	256		/* maximum domain name */
#define	MAXCDNAME	255		/* maximum compressed domain name */
#define	MAXLABEL	63		/* maximum length of domain label */
	/* Number of bytes of fixed size data in query structure */
#define	QFIXEDSZ	4
	/* number of bytes of fixed size data in resource record */
#define	RRFIXEDSZ	10

/*
 * Internet nameserver port number
 */
#define	NAMESERVER_PORT	53

/*
 * Currently defined opcodes
 */
#define	QUERY		0x0		/* standard query */
#define	IQUERY		0x1		/* inverse query */
#define	STATUS		0x2		/* nameserver status query */
/* #define	xxx		0x3 */	/* 0x3 reserved */
	/* non standard */
#define	UPDATEA		0x9		/* add resource record */
#define	UPDATED		0xa		/* delete a specific resource record */
#define	UPDATEDA	0xb		/* delete all nemed resource record */
#define	UPDATEM		0xc		/* modify a specific resource record */
#define	UPDATEMA	0xd		/* modify all named resource record */

#define	ZONEINIT	0xe		/* initial zone transfer */
#define	ZONEREF		0xf		/* incremental zone referesh */

/*
 * Currently defined response codes
 */
#define	NOERROR		0		/* no error */
#define	FORMERR		1		/* format error */
#define	SERVFAIL	2		/* server failure */
#define	NXDOMAIN	3		/* non existent domain */
#define	NOTIMP		4		/* not implemented */
#define	REFUSED		5		/* query refused */
	/* non standard */
#define	NOCHANGE	0xf		/* update failed to change db */

/*
 * Type values for resources and queries
 */
#define	T_A		1		/* host address */
#define	T_NS		2		/* authoritative server */
#define	T_MD		3		/* mail destination */
#define	T_MF		4		/* mail forwarder */
#define	T_CNAME		5		/* connonical name */
#define	T_SOA		6		/* start of authority zone */
#define	T_MB		7		/* mailbox domain name */
#define	T_MG		8		/* mail group member */
#define	T_MR		9		/* mail rename name */
#define	T_NULL		10		/* null resource record */
#define	T_WKS		11		/* well known service */
#define	T_PTR		12		/* domain name pointer */
#define	T_HINFO		13		/* host information */
#define	T_MINFO		14		/* mailbox information */
#define	T_MX		15		/* mail routing information */
#define	T_TXT		16		/* text strings */
	/* non standard */
#define	T_UINFO		100		/* user (finger) information */
#define	T_UID		101		/* user ID */
#define	T_GID		102		/* group ID */
#define	T_UNSPEC	103		/* Unspecified format (binary data) */
	/* Query type values which do not appear in resource records */
#define	T_AXFR		252		/* transfer zone of authority */
#define	T_MAILB		253		/* transfer mailbox records */
#define	T_MAILA		254		/* transfer mail agent records */
#define	T_ANY		255		/* wildcard match */

/*
 * Values for class field
 */

#define	C_IN		1		/* the arpa internet */
#define	C_CHAOS		3		/* for chaos net at MIT */
#define	C_HS		4		/* for Hesiod name server at MIT */
	/* Query class values which do not appear in resource records */
#define	C_ANY		255		/* wildcard match */

/*
 * Status return codes for T_UNSPEC conversion routines
 */
#define	CONV_SUCCESS 0
#define	CONV_OVERFLOW -1
#define	CONV_BADFMT -2
#define	CONV_BADCKSUM -3
#define	CONV_BADBUFLEN -4

/*
 * Structure for query header, the order of the fields is machine and
 * compiler dependent, in our case, the bits within a byte are assignd
 * least significant first, while the order of transmition is most
 * significant first.  This requires a somewhat confusing rearrangement.
 */

typedef struct {
	u_short	id;		/* query identification number */
#if defined(_BIT_FIELDS_HTOL) || defined(BIT_ZERO_ON_LEFT)
	/* Bit zero on left:  SPARC and similar architectures */
			/* fields in third byte */
	u_char	qr:1;		/* response flag */
	u_char	opcode:4;	/* purpose of message */
	u_char	aa:1;		/* authoritive answer */
	u_char	tc:1;		/* truncated message */
	u_char	rd:1;		/* recursion desired */
			/* fields in fourth byte */
	u_char	ra:1;		/* recursion available */
	u_char	pr:1;		/* primary server required (non standard) */
	u_char	unused:2;	/* unused bits */
	u_char	rcode:4;	/* response code */
#else
#if defined(_BIT_FIELDS_LTOH) || defined(BIT_ZERO_ON_RIGHT)
	/* Bit zero on right:  Intel x86 and similar architectures */
			/* fields in third byte */
	u_char	rd:1;		/* recursion desired */
	u_char	tc:1;		/* truncated message */
	u_char	aa:1;		/* authoritive answer */
	u_char	opcode:4;	/* purpose of message */
	u_char	qr:1;		/* response flag */
			/* fields in fourth byte */
	u_char	rcode:4;	/* response code */
	u_char	unused:2;	/* unused bits */
	u_char	pr:1;		/* primary server required (non standard) */
	u_char	ra:1;		/* recursion available */
#else
	/* you must determine what the correct bit order is for your compiler */
	UNDEFINED_BIT_ORDER;
#endif
#endif
			/* remaining bytes */
	u_short	qdcount;	/* number of question entries */
	u_short	ancount;	/* number of answer entries */
	u_short	nscount;	/* number of authority entries */
	u_short	arcount;	/* number of resource entries */
} HEADER;

/*
 * Defines for handling compressed domain names
 */
#define	INDIR_MASK	0xc0

/*
 * Structure for passing resource records around.
 */
struct rrec {
	short	r_zone;			/* zone number */
	short	r_class;		/* class number */
	short	r_type;			/* type number */
	u_long	r_ttl;			/* time to live */
	int	r_size;			/* size of data area */
	char	*r_data;		/* pointer to data */
};

extern	u_short	_getshort();
extern	u_long	_getlong();

/*
 * Inline versions of get/put short/long.
 * Pointer is advanced; we assume that both arguments
 * are lvalues and will already be in registers.
 * cp MUST be u_char *.
 */
#define	GETSHORT(s, cp) { \
	(s) = *(cp)++ << 8; \
	(s) |= *(cp)++; \
}

#define	GETLONG(l, cp) { \
	(l) = *(cp)++ << 8; \
	(l) |= *(cp)++; (l) <<= 8; \
	(l) |= *(cp)++; (l) <<= 8; \
	(l) |= *(cp)++; \
}


#define	PUTSHORT(s, cp) { \
	*(cp)++ = (s) >> 8; \
	*(cp)++ = (s); \
}

/*
 * Warning: PUTLONG destroys its first argument.
 */
#define	PUTLONG(l, cp) { \
	(cp)[3] = l; \
	(cp)[2] = (l >>= 8); \
	(cp)[1] = (l >>= 8); \
	(cp)[0] = l >> 8; \
	(cp) += sizeof (u_long); \
}

#ifdef	__cplusplus
}
#endif

#endif /* _ARPA_NAMESER_H */
